Trying to be a good friend... don't know what to do...

Here's a little background.... I met this girl about 2 years ago, and have confided in her about me and my husband's struggle to have a baby... let's call her "Sydney." She has a 3 year old son of her own with her ex, who she was "super in love with." She has been a super suportive friend to me up until recently...

She has been "dating" a bunch of guys, trying to find one to settle down with.... She says she just can't get over her "baby daddy," but he is in a relationship with this girl he met at work. She is 17 and he is 23. Not a big deal, but she is young and naive and I feel really bad for her because of what I am about to type next.. Sydney and her ex still talk because of their kid and he went ahead and told her that his new girlfriend is pregnant because she kept insisting that he break up with her and they get back together. Well she was FURIOUS, threatening to go up to his work and trash his car and all sorts of things. They didn't talk for a week or two after that and when they started talking again, she persuaded him to get back together with her and talk his girlfriend into getting an abortion or he wouldn't be seeing his son. She even told him she would pay for it and everything. Well, it happened. She paid for his girlfriend to get an abortion and swept it under the rug like it never happened. I know that girl could have probably stood up and said no, but I feel like she was super manipulated. He told Sydney that his girlfriend wanted to keep the baby, but Sydney told him to say that he wouldn't be there or be around for her and the baby. This happened a few months ago and now Sydney is PREGNANT, acting like they are a happy little family. I try to be a good friend, but I feel like this is such a horrible thing and because she obviously isn't sorry, it's hard for me to stay friends with her. I've looked on the other girls facebook and it is clear that she is unhappy :( I feel like reaching out, but it probably isn't my place. She posted a status a few weeks ago that said "I'm sorry I didn't let you breathe." Idk what to do. Is it okay to just "ghost" a friendship?